The `NgModuleDecoratorHandler` can now register all the references that
it finds in the `NgModule` metadata, such as `declarations`, `imports`,
`exports` etc.

This information can then be used by ngcc to work out if any of these
references are internal only and need to be manually exported from a
library's entry-point.

PR Close #26906

PR Close #26906

PR Close #26906

…ariables (#26906)

These variables are already declared as protected in the super class, and
so it is redundant to do it again in the subclasses.

PR Close #26906

There are a number of variables that need to be passed around
the program, in particular to the renderers, which benefit from being
stored in well defined objects.

The new `EntryPointBundle` structure is a specific format of an entry-point
and contains the compiled `BundleProgram` objects for the source and typings,
if appropriate.

This change helps with future refactoring, where we may need to add new
properties to this object. It allows us to maintain more stable APIs between
the constituent parts of ngcc, rather than passing lots of primitive values
around throughout the program.

PR Close #26906

This analyzer searches the source for declared classes that are not
exported publicly from the entry-point.

PR Close #26906

Ngcc will now render additional exports for classes that are referenced in
`NgModule` decorated classes, but which were not publicly exported
from an entry-point of the package.

This is important because when ngtsc compiles libraries processed by ngcc
it needs to be able to publcly access decorated classes that are referenced
by `NgModule` decorated classes in order to build templates that use these
classes.

Doing this re-exporting is not without its risks. There are chances that
the class is not exported correctly: there may already be similarly named
exports from the entry-point or the class may be being aliased. But there
is not much more we can do from the point of view of ngcc to workaround
such scenarios. Generally, packages should have been built so that this
approach works.

PR Close #26906

PR Close #26906